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                <a name="asio.reference.placeholders__signal_number"></a><a class="link"
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                                                                            title="placeholders::signal_number">placeholders::signal_number</a>
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    <p>
        <a class="indexterm" name="asio.indexterm.placeholders__signal_number"></a>
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    <p>
        An argument placeholder, for use with boost::bind(), that corresponds to
        the signal_number argument of a handler for asynchronous functions such as
        <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">signal_set</span><span class="special">::</span><span
                class="identifier">async_wait</span></code>.
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    <pre class="programlisting"><span class="identifier">unspecified</span> <span
            class="identifier">signal_number</span><span class="special">;</span>
</pre>
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        <a name="asio.reference.placeholders__signal_number.h0"></a>
        <span><a name="asio.reference.placeholders__signal_number.requirements"></a></span><a class="link"
                                                                                              href="placeholders__signal_number.html#asio.reference.placeholders__signal_number.requirements">Requirements</a>
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        <span class="emphasis"><em>Header: </em></span><code class="literal">asio/placeholders.hpp</code>
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    <p>
        <span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
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            <div class="copyright-footer">Copyright © 2003-2022 Christopher M. Kohlhoff<p>
                Distributed under the Boost Software License, Version 1.0. (See accompanying
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